Frequently Asked

Why am I not readin zero when the SCT is not connected

The SCT sensor is an analog sensor and hence has a background noise. i.e. It will never read the exact measured value.

Even if nothing is connected there will be always a tiny current running in the burden resistor inducing a small voltage. In turn this will convert into a small power. For a board setup for the SCT-013-000 one might find a background noise under 100W.

This is normal!

I can not read anything once the CT is clamped

Make sure the SCT is clamped around A SINGLE PHASE.

Clamping the SCT on the whole cable will never read anything as it will measure two currents. One positive minus plus one negative which sums to 0 (or 0 + noise).

The easiest for a quick test is to connect the SCT at the meter level on a single phase. Otherwise if you wish to measure the power used by a single application then one should make a special cable that split phases.